Check at the nursing library. Some nursing instructors file their past exam questions and assignments at the library as part of the permanent record, because this resource helps students prepare for tests. If you can't find the materials, ask a librarian for help.
Approach your instructors and inquire if they have past assignments that you could use to practice.
Ask other nursing students if they have last year's tests or examination questions. If you put out the word that you are looking for practice assignments, people who have them may offer to lend you theirs or let you photocopy them.
Go to the source if you are writing the National Council License Examination. The National Council of State Boards of Nursing offers online practice tests to help nursing students prepare. Practice doing the computer multiple-choice test to become familiar with the format and the types of questions you will be expected to answer.